When He^3 melts the volume increases. The accompanying plot...

When $\mathrm{He}^3$ melts the volume increases. The accompanying plot is a sketch of the $\mathrm{He}^3$ melting curve from 0.02 to 1.2 K . Make a sketch to show the change in entropy which accompanies melting in this temperature range.
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Key Concepts

Clapeyron Relation

The Clapeyron relation connects the slope of the phase boundary in a pressure-temperature diagram to the changes in entropy and volume during a phase transition. It shows that if a phase transition involves an increase in volume upon melting, then a positive slope of the melting curve requires that the entropy of the liquid is higher than that of the solid.

Latent Heat and Entropy Change

Latent heat is the energy absorbed or released during a phase transition at constant temperature. In the context of melting, the absorption of latent heat leads to an increase in entropy, reflecting the greater disorder in the liquid phase compared to the solid phase.

Phase Transition

A phase transition is the transformation of a substance from one state of matter to another, such as from solid to liquid during melting. It typically involves the absorption or release of energy, known as latent heat, and is accompanied by changes in physical properties like density, volume, and entropy.

Melting Curve

The melting curve is a graphical representation of the conditions (typically temperature and pressure) under which the solid and liquid phases coexist in equilibrium. It demonstrates how the melting temperature varies with pressure and is a crucial tool for understanding phase equilibria.

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